vba - Run SQL on field value change using previous value and new value -


i'm new vba , access , have inherited database needs improvement.

i have form in access shows table editing: enter image description here

when labour rate value in table changed need run following query update table:

update finishedproduct set labourrate = newvalue labourrate = oldvalue;

(yes design of database bad.)

  • which event can handle react labour rate changing?

  • how can previous value of field , new value of field?

  • something don't know: when user changes labour rate value in grid table updated immediately?

you can use beforeupdate event of form , oldvalue has previous value (value new value):

private sub form_beforeupdate(cancel integer)     msgbox me.txtlabourrate.oldvalue     msgbox me.txtlabourrate.value end sub

this happens just before record updated. cannot use afterupdate event of form because oldvalue same new value.

beforeupdate happens immediately before record updated. record updated - unless cancel argument set true. there current event form happens after record has been updated , old/value reflect of current row - row have moved to.

it possible use afterupdate event of form, there no need: use beforeupdate. in order use afterupdate need use current event store old/current value in variable.

when field changed record not updated immediately, whole record updated when move away current row (record).


Comments

Post a Comment

Popular posts from this blog

basic authentication with http post params android -

i doing basic authentication passing username , password , using basicnamevaluepair sending post params response service. my method: public stringbuilder callservicehttppost(string username, string password, string type) { // create new httpclient , post header httpclient httpclient = new defaulthttpclient(); httppost httppost = new httppost(webservice + type); httpresponse response = null; stringbuilder total = new stringbuilder(); try { url url = new url(webservice + type); /*string base64encodedcredentials = base64.encodetostring((username + ":" + password).getbytes(), base64.url_safe | base64.no_wrap);*/ string base64encodedcredentials = "basic " + base64.encodetostring( (username + ":" + password).getbytes(), base64.no_wrap); httppost.setheader("auth...
Read more

vb.net - Virtual Keyboard commands -

i wondering difference between virtual these keyboard commands is: keyeventf_extendedkey , keyeventf_keyup is. everywhere have looked gives me description based off integers , not want know each of them does. you've tagged question vb.net, these have nothing @ vb.net. they're constants defined in windows header files, use win32 api functions. as far difference, can't tell looking @ values. individual values not particularly important, that's why named identifiers used. what's important used , documentation functions tells mean. the first one, keyeventf_extendedkey , used keybdinput structure (which used along e.g. sendinput function) pass information synthesized keyboard input. if flag used, means scan code should interpreted extended key. technically, means scan code preceded prefix byte value 224 (&he0 in hexadecimal notation). the second one, keyeventf_keyup , 1 of flags available use structure. means key being released (going up)...
Read more

css - Firefox for ubuntu renders wrong colors -

Image
i've got following problem: i'm developing website, while testing around i've noticed firefox , chromium display css bar in different colors. when switched between several machine come conclusion firefox ubuntu problem. on other devices i've tested website. it's fine. the differences between chrome , firefox rendering: firefox: chromium: note: firefox ubuntu problem. does knows why , came solution? https://bugzilla.mozilla.org/show_bug.cgi?id=655637 bug 629312 - firefox displays wrong colors on image (only linux) open about:config , rechange gfx.color_management.mode 2 0.
Read more